JP2010151318A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable connection with excellent sealing performance regardless of the dimension of the diameter of a connecting pipe and appropriate connection preventing the slip-off of the connecting pipe by securely pressing each slip-off prevention ball on the outer face of the connecting pipe by a tightening force of a bolt etc. for interconnecting and fixing a joint body and a flange body. <P>SOLUTION: This pipe joint includes: a ring-shaped packing for compression and sealing between the connecting pipe outer face, the joint body and the flange body during integral connection of the joint body and the flange body; and a slip-off prevention mechanism for preventing the pipe from slipping off by pressing the plurality of slip-off prevention balls on the connecting pipe outer face by a tapered face formed on the inner face of the flange body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting a drain pipe having a relatively large diameter, for example.

  Conventionally, as a retaining mechanism for a connecting pipe such as a drain pipe connected to a pipe joint, a taper with a large opening diameter on the outer surface formed by retaining balls using hard balls at equal intervals in the circumferential direction of the sleeve The retaining ball is pressed against the outer surface of the connecting pipe by an inclined surface formed on the inner surface of the joint body, etc. by pushing it outward with an elastic member such as a coil spring or leaf spring with a sleeve placed on the back side. Thus, there is a technique for preventing the connection pipe from coming out. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-272895

  However, when the sleeve is pushed outward with an elastic member such as a coil spring as described above, it is difficult to push the sleeve with a uniform force. Thus, there is a disadvantage that the connection pipe cannot be surely pulled out as the connection pipe has a larger diameter.

  Further, the larger the diameter, the lower the sealing effect of the sealing member, and there is a disadvantage that water leaks under low pressure conditions.

  Therefore, the present invention provides a ring-shaped packing that is compressed and sealed between the outer surface of the connecting pipe, the joint body and the flange body when the joint body and the flange body are integrally connected, and a tapered surface formed on the inner surface of the flange body. A retaining mechanism is provided to prevent the tube from coming off by pressing a plurality of retaining balls against the outer surface of the connecting tube, and a plurality of shaft insertion holes for inserting the extruded shaft are opened at equal intervals on the same circumference on one side of the packing. Insert the other end of the extrusion shaft that contacts one end with the holder that holds the retaining ball into the shaft insertion hole of the packing so that it can slide freely. It is provided to advance from the packing and press the retaining ball against the outer surface of the connecting pipe.

  Thus, as shown in claim 1, a plurality of shaft insertion holes into which the extrusion shaft is inserted are opened at equal intervals on the same circumference on one side of the packing, and one end side is brought into contact with the holder holding the retaining ball. Insert the other end of the extrusion shaft into the shaft insertion hole of the packing so that it can slide freely. Compared with the structure that pushes the extrusion shaft through the packing shaft hole by pressing, water leakage through the shaft hole is prevented, the water sealing performance by the packing is improved, and the fitting accuracy of this pipe joint is improved. Is.

The cross-sectional side view which shows the pipe joint which concerns on the comparative example with respect to this invention. FIG. Installation explanatory drawing of a retaining mechanism. Explanatory drawing which shows the water stop completion state of a retaining mechanism. Explanatory drawing which shows the retaining completion state of a retaining mechanism. Explanatory explanatory drawing of a retaining mechanism part. Explanatory drawing of packing. Explanatory drawing of a seat plate and an extrusion shaft. Explanatory drawing of a holder. Explanatory drawing of a retaining ball. Explanatory drawing of packing deformation structure. Explanatory drawing of a flange type joint main part. The cross-sectional side view of the pipe joint which concerns on this invention. Explanatory drawing of the retaining mechanism part of the pipe joint. Explanatory drawing of the packing of the pipe joint which concerns on this invention.

  Hereinafter, a comparative example for the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional side view showing a pipe joint according to a comparative example of the present invention. FIG. 2 is a plan view of the pipe joint. In the figure, reference numeral 1 denotes a socket-shaped metal joint body of a metal pipe P to be connected. A joint receiving port portion 1a for inserting the end portion is integrally formed symmetrically at both ends of the joint main body 1, and each joint receiving port portion 1a is an end of a pipe (hereinafter referred to as “connection pipe”) P inserted therein. A seal retaining mechanism 2 for connecting the parts in an airtight and non-extractable manner is provided, and this mechanism will be described below.

  As shown in FIG. 3 to FIG. 6, the inner surface of the joint receiving portion 2 has an axial position from the opening end (outer end) to the depth side to the depth side (inward in the axial direction) to the depth side. A taper surface 3 is formed to reduce the diameter as it goes (the diameter increases as it goes outward in the axial direction), and an insertion hole 4 for inserting the connecting pipe P is formed from the innermost end of the taper surface 3 to the inner side. It is formed.

  In addition, a cylindrical rubber packing 6 is provided to be fitted to the outside of the connecting pipe P, and the tapered portion 5 formed on the outer surface of the front end is fitted into the joint receiving portion 1a so as to be in close contact with the tapered surface 3, and the rubber packing 6 is provided. A flange body 8 to be compressed from the rear end through the seat plate 7 is provided, and a plurality of bolts 11 are inserted into the bolt holes 9 and 10 of the joint body 1 and the flange body 8 so that the rubber packing 6 is compressed when these are integrally connected. It is configured to do.

  The flange body 8 has an engagement step 12 for restricting the position of the seat plate 7 at a fixed insertion position on the inner end side (joint body 1 side) and an inner diameter on the outer end side (opposite side of the joint body 1). A ring-shaped holder 15 having a plurality of retaining balls 14 in the circumferential direction is disposed between the seat plate 7 held at the engagement step portion 12 and the tapered surface 13. ing.

  As shown in FIG. 9, the holder 15 is made of an elastic material made of the same material as the packing 6 such as a rubber material, and has an outer tapered surface 16 opposed to the tapered surface 13 on the outer peripheral surface and an inner diameter from the inner end to the outer end. The inner side surface is formed on the inner tapered surface 17 that expands the diameter of the holder 15, the cross section of the holder 15 is formed in a trapezoidal shape, and six (60 degree intervals) are provided in the circumferential direction of the holder 15 around the axis of the connecting pipe P. A rectangular through hole 18 for inserting the retaining ball 14 is opened, and the elongated hole 18 is formed in a slightly smaller shape than the retaining ball 14 so that the retaining ball 14 is elastically held in the elongated hole 18. Yes.

  Further, as shown in FIG. 10, the retaining ball 14 is formed of a metal material such as stainless steel into a solid barrel shape, and the outer surface is knurled to form a knurling 19 substantially parallel to the axial direction. The maximum diameter of the retaining ball 14 is set to be slightly larger than the thickness of 15.

  As shown in FIGS. 7 and 8, the packing 6 and the seat plate 7 have through-shaft holes 21 and 22 through which the eight extrusion shafts 20 penetrate in the circumferential direction around the axis of the connecting pipe P. When the packing 6, the seat plate 7, and the holder 15 are mounted on the outer surface of the connecting pipe P, the extrusion shaft 20 is held through the packing 6 and the seat plate 7, and the joint body 1 and the flange body are operated by operating the bolt 11. When compressing the packing 6 that is integrally connected to the holder 8, the holder 15 is pushed outward by the extrusion shaft 20, and the retaining ball 14 held by the holder 15 is pressed against the tapered surface 13 of the flange body 8, so that the tapered surface 13 From each, the retaining balls 14 are forced to be pushed into the outer surface of the pipe P by applying a pushing force for pushing the retaining balls 14 toward the center of the pipe P, and are connected from the joint receiving portion 1a. Tube P comes out It is configured to prevent a.

  On the other hand, when the connection between the joint body 1 and the flange body 8 is released by loosening the bolt 11, the pressing force by the tapered surface 13 against the retaining ball 14 is released, and the holder 15 and the retaining ball 14 are free to move. In this state, the connecting pipe P can be freely inserted and removed.

  This comparative example is configured as described above, and the fitting main body 1 is fitted with the retaining mechanism 2 such as the holder 15 having the packing 6, the seat plate 7, and the retaining ball 14 on the outer surface of the connecting pipe P. The connecting pipe P is inserted into the joint receiving portion 1a. When the retaining mechanism 2 is mounted, the flange body 8 is mounted on the connecting pipe P together with the seat 23, and then the bolt 11 is tightened as shown in FIG. When the flange body 8 is brought close to the joint body 1, the packing 6 is compressed so that the water stoppage is completed. At this time, the retaining ball 14 is held in a state of being in contact with the tapered surface 13 of the flange body 8, and then As shown in FIG. 5, when the joint body 1 and the flange body 8 are brought into close contact with the seat 23 by further tightening the bolt 11, the gap between the joint body 1, the flange body 8, and the connecting pipe P is filled with the packing 6. That causes compressed state, thereby preventing the escape of the connecting pipe P is pressed against the stop bead 14 exits the action for pressing the tapered surface 13 on the stop bead 14 exits to connect pipes P outer surface.

  Further, as described above, the packing 6 compressed between the joint body 1 and the flange body 8 (seat plate 7) is compressed in an unbalanced manner by the extrusion shaft 20 that slidably penetrates at equal intervals in the circumferential direction. The pipe 6 is compressed almost uniformly in the circumferential direction of the packing 6 to provide a good seal, and even when the connecting pipe P has a large diameter, a high-precision pipe connection with no leakage even at low pressure or high pressure is achieved. Yes.

  In the above comparative example, the means for fastening and fixing the joint body 1 and the flange body 8 is shown. However, a pin is provided on one of the joint body 1 and the flange body 8 and a notch to be engaged with this pin is provided on the other side. Any fixing means such as a means for fixing the joint body 1 and the flange body 8 by engaging the pin and the notch may be used.

  As apparent from the above, the joint body 1 and the flange body 8 are formed on the outer surface of the connecting pipe P, the ring-shaped packing 6 that is compressed and sealed between the joint body 1 and the flange body 8 and the inner surface of the flange body 8. The taper surface 13 is provided with a retaining mechanism 2 that presses a plurality of retaining balls 14 against the outer surface of the connecting pipe P to prevent the pipe from coming out, and has good sealing performance regardless of the diameter of the connecting pipe P. The connection pipe P can be pulled out by pressing the retaining balls 14 securely against the outer surface of the connection pipe P with a tightening force such as a bolt 11 for connecting and fixing the joint body 1 and the flange body 8. There is no proper connection that can be made possible.

  Further, a plurality of extrusion shafts 20 that connect the holder 15 that holds the retaining ball 14 and the joint body 1 are slidably provided on the same circumference of the packing 6, so that the joint body 1, the flange body 8, Are provided so that the holder 15 is moved to the flange body 8 side by the extrusion shaft 20 at the time of the integral connection of the bolts, and the tightening force of the bolt 11 or the like when the joint body 1 and the flange body 8 are connected and fixed is prevented from coming off. It can be reliably transmitted to the ball 14 to prevent the connection pipe P from coming out reliably.

  Further, the holder 15 is formed of an elastic material, and when the retaining mechanism 2 is assembled or removed from the joint body 1, the holder 15 can be easily handled with each retaining ball 14 held. This makes it possible to improve the efficiency of the work and improve the assembly accuracy.

  Further, a seat plate 7 that abuts and holds the end face of the packing 6 between the packing 6 and the holder 15 is provided on the flange body 8. When the joint body 1 and the flange body 8 are integrally connected, the seat plate 7 and the flange body 8 are provided. It is possible to improve the sealing performance by properly compressing the packing 6 between them and to facilitate the proper movement of the extrusion shaft 20 by the seat plate 7 to prevent the connection pipe P from being reliably pulled out by the retaining balls 14. It can be done.

  As shown in FIG. 11, a bellows type packing 8A in which the front end side (insertion end side) of the packing 8 is extended so that the bent edge 8a faces between the joint body 1 and the tip of the connecting pipe P may be used. There are substantially the same effects as the comparative example.

  Further, in the comparative example, the configuration example in which the connection pipe P is connected to the socket-type joint body 1 is shown, but in addition to the configuration in which the connection pipe P is connected to the flange-type joint body 1A as shown in FIG. Any joint body such as elbow type, T type and close type may be used.

  Furthermore, in the comparative example described above, the configuration was shown in which the through-shaft hole 21 was opened in the packing 6 and the extrusion shaft 20 was slidably held. However, in the embodiment of the present invention, as shown in FIGS. Extrusion shaft 20A (extrusion shaft) in which a plurality of shaft insertion holes 24 having a constant depth are provided at equal intervals in the circumferential direction on the side surface of the 6 seat plate 7 in contact with the holder 15 as in the previous comparative example. The other end side (shorter than 20) may be slidably inserted into the shaft insertion hole 24.

  In this case, at the time of compression of the packing 6 for integrally connecting the joint body 1 and the flange body 8 by operating the bolt 11, the extrusion shaft 20A is moved outward from the packing 6 (seat plate 7) according to the compression of the packing 6, and the holder 15 is pressed against the taper surface 13, and, as in the previous embodiment, from the taper surface 13, a pressing force is applied to each retaining ball 14 toward the center of the tube P, and each retaining ball 14 is moved to the tube P. It is configured to prevent the connecting pipe P from coming out of the joint receiving portion 1a by forcibly pressing the outer surface of the joint receiving portion 1a.

  As is clear from the above, a plurality of shaft insertion holes 24 into which the extrusion shaft 20A is inserted are opened at equal intervals on the same circumference on one side of the packing 6, and one side of the holder 15 holding the retaining ball 14 is placed on one side. The other end of the extruded shaft 20A to be brought into contact is slidably inserted into the shaft insertion hole 24 of the packing 6, and the extruded shaft 20A advances from the packing 6 when the packing 6 is compressed by the integral connection of the joint body 1 and the flange body 8. In this case, the retaining ball 14 is pressed against the outer surface of the connecting pipe P. Compared with a configuration in which the extrusion shaft is held through the through-shaft hole of the packing 6, water leakage through the shaft hole is prevented, and the water-stopping by the packing 6 is prevented. The performance can be improved, and the joint accuracy of this pipe joint can be improved.

DESCRIPTION OF SYMBOLS 1 Joint main body 2 Retaining mechanism 6 Packing 7 Seat plate 8 Flange body 14 Retaining ball 15 Holder 20 Extrusion shaft 20A Extrusion shaft 24 Shaft insertion hole P Connection pipe

Claims (1)

  A ring-shaped packing that compresses and seals between the joint pipe outer surface and the joint body and the flange body when the joint body and flange body are connected together, and a plurality of retaining balls are pressed against the outer surface of the connection pipe with a tapered surface formed on the flange body inner surface. A retaining mechanism is provided to prevent the pipe from slipping out, and a plurality of shaft insertion holes for inserting the extrusion shaft are opened at equal intervals on the same circumference on one side of the packing, and one end side of the holder holding the retaining ball is The other end of the extruded shaft to be contacted is slidably inserted into the shaft insertion hole of the packing, and when the packing is compressed by the integral connection of the joint body and flange body, the extruded shaft is advanced from the packing to connect the retaining ball. A pipe joint provided to be pressed against the outer surface of the pipe

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